Tell us what you have now. The above is correct - a working Wingman is better than anything else for an RV, unless you want to carry around a huge home TV antenna and mast.
Assuming you have a Winegard, if yours isn't cutting it, you may need to aim it toward the stations (there are web sites and phone apps which will help), it may need a Wingman add-on ($30) to pick up UHF stations better, you may not be pushing the button to power the amplifier, or the amp in the antenna may be bad ($50 for a replacement head, including the Wingman). All of which are easily fixed.